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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Bulletin of the Korean Chemical Society
Journal Basic Information
Journal DOI :
Korean Chemical Society
Editor in Chief :
Byeong Moon Kim
Volume & Issues
Volume 20, Issue 12 - Dec 1999
Volume 20, Issue 11 - Nov 1999
Volume 20, Issue 10 - Oct 1999
Volume 20, Issue 9 - Sep 1999
Volume 20, Issue 8 - Aug 1999
Volume 20, Issue 7 - Jul 1999
Volume 20, Issue 6 - Jun 1999
Volume 20, Issue 5 - May 1999
Volume 20, Issue 4 - Apr 1999
Volume 20, Issue 3 - Mar 1999
Volume 20, Issue 2 - Feb 1999
Volume 20, Issue 1 - Jan 1999
Selecting the target year
Catalytic Dehalogenation of Monohalopyridines with Titanocene Complexes
우희권 ; 김보혜 ; 송선정 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 865~866
(Salen)Mn-Catalyzed Oxygenation of Vinyl Arenes to the Corresponding Alcohols in the Presence of Sodium Borohydride
이남호 ; 백종석 ; 한성빈 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 867~868
Electrochemical Studies on the Mechanism of the Fabrication of Ceramic Films by Hydrothermal-Electrochemical Technique
Zhibin Wu ; Masahiro Yoshimura ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 869~874
In this paper, electrochemical techniques are used to investigate hydrothermal-electrochemically formation of barium titanate (BT) ceramic films. For comparison, the electrochemical behaviors of anodic titanium oxide films formed in alkaline solution were also investigated both at room temperature and in hydrothermal condition at 150.0 ℃. Film structure and morphology were identified by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Titanium oxide films produced at different potentials exhibit different film morphology. The breakdown of titanium oxide films anodic growth on Ti electrode plays an important roles in the formation of BT films. BT films can grow on anodic oxide/metal substrate interface by short-circuit path, and the dissolution-precipitation processes on the ceramic film/solution interface control the film structure and morphology. Based upon the current experimental results and our previous work, extensively schematic proce-dures are proposed to model the mechanism of ceramic film formation by hydrothermal-electrochemical method.
Soft Solution Processing : Low-Energy Direct Fabrication of Advanced Inorganic Materials
Masahiro Yoshimura ; 한규승 ; Wojciech Suchanek ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 875~878
A new concept ？？soft solution processing？？ has been introduced to fabricate advanced solid state materials in an economical, environmentally friendly, and energy and material efficient way. The prepared films show the desired and prospective properties despite of low temperature synthesis and no post-synthesis annealing. Successful examples demonstrate that soft solution processing is capable of preparing advanced materials with planned properties through the easy control of reaction conditions in a suitable aqueous solution in a single synthetic step without huge energy consumption and without any sophisticated equipment.
Tailoring of the Porosity in Sol-Gel Derived Silica Thin Layers
M. Klotz ; A. Ayral ; C. Guizard ; L. Cot ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 879~884
The sol-gel process enables the preparation of ceramic thin films ranging in characteristics from dense to highly porous layers. Based on the example of silica layers, this paper focuses on the importance of the choice of the various synthesis parameters to tailor the porosity of the final material and new opportunities associated to the templating effect. The problems related to the characterization of the porosity in the case of thin films are also considered.
PLR (Plastic Lithium Rechargeable) Batteries using Nanoscale Materials : A Convenient Source of Electrical Energy for the Future?
G. Campet ; N. Treuil ; A. Poquet ; S. J. Hwang ; C. Labrugere ; A. Deshayes ; J. C. Frison ; J. Portier ; J. M. Reau ; J. H. Choy ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 885~892
This communication describes the synthesis of : (i) non-toxic and low cost nanocrystalline electrode materials, which can be prepared advantageously at low temperature ; (ii) highly conductive electrolyte membranes formed by the nano-encapsulation within a poly(acrylonitrile)-based polymer matrix of a solution of LiPF6 in organic solvants. The performances of rechargeable PLR (Plastic Lithium Rechargeable) batteries using the above mentioned components are presented.
Chemical Design of Highly Water-Soluble Ti, Nb and Ta Precursors for Multi-Component Oxides
Masato Kakihana ; Judith Szanics ; Masaru Tada ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 893~896
Novel citric acid based Ti, Nb and Ta precursors that are highly stable in the presence of water were developed. No alkoxides of Ti, Nb and Ta were utilized in the preparation, instead much less moisture-sensitive metallic Ti, NbCl5 and TaCl5 were chosen as starting chemicals for Ti, Nb and Ta, respectively. The feasibility of these chemicals as precursors is demonstrated in the powder synthesis of BaTi4O9, Y3NbO7 and LiTaO3. The water-resistant Ti precursor was employed as a new source of water-soluble Ti in the amorphous citrate method, and phase pure BaTi4O9 in powdered form was successfully synthesized at 800 ？. The Pechini-type polymerizable complex method using the water-resistant Nb and Ta precursors was applied to the synthesis of Y3NbO7 and LiTaO3, and both the powder materials in their pure form were successfully synthesized at reduced tempera-tures, viz. 500-700 ？. The remarkable retardation of hydrolysis of these water-resistant precursors is explained in terms of the partial charge model theory.
Molecular Dynamics Simulation Studies of Physico Chemical Properties of Liquid Pentane Isomers
이승구 ; 이송희 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 897~904
We have presented the thermodynamic, structural and dynamic properties of liquid pentane isomers - normal pentane, isopentane, and neopentane - using an expanded collapsed atomic model. The thermodynamic properties show that the intermolecular interactions become weaker as the molecular shape becomes more nearly spherical and the surface area decreases with branching. The structural properties are well predicted from the site-site radial, the average end-to-end distance, and the root-mean-squared radius of gyration distribution func-tions. The dynamic properties are obtained from the time correlation functions - the mean square displacement (MSD), the velocity auto-correlation (VAC), the cosine (CAC), the stress (SAC), the pressure (PAC), and the heat flux auto-correlation (HFAC) functions - of liquid pentane isomers. Two self-diffusion coefficients of liquid pentane isomers calculated from the MSD's via the Einstein equation and the VAC's via the Green-Kubo relation show the same trend but do not coincide with the branching effect on self-diffusion. The rotational re-laxation time of liquid pentane isomers obtained from the CAC's decreases monotonously as branching increases. Two kinds of viscosities of liquid pentane isomers calculated from the SAC and PAC functions via the Green-Kubo relation have the same trend compared with the experimental results. The thermal conductivity calculated from the HFAC increases as branching increases.
Synthesis and Molecular Structure of Tetrahomodioxa p-Phenylcalixarene Tetra Ester Derivative in 1,4-Alternate Conformation
노관현 ; 박영자 ; 최은주 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 905~909
Reaction of tetrahomodioxa p-phenylcalixarene with ethyl bromoacetate and potassium carbonate in ace-tone leads to the title tetra ester derivative, 7,13,21,27-tetra-phenyl-29,30,31,32 -tetrakis(ethoxycarbonyl)meth-oxy-2,3,16,17-tetrahomo-3,17-dioxacalixarene, its structure was determined by NMR spectra as 1,4-alternate conformation. The molecular structure has been solved by X-ray diffraction methods. The molecule has a conformation with pseudo center of symmetry. The benzene ring A is up, ring C is down, B and D rings are flat with respect to the plane of the macrocyclic ring.
Quantitative Analysis of Trace pp'-DDE in Corn Oil by Isotope Dilution Mass Spectrometry : Uncertainty Evaluations
김병주 ; 김달호 ; 최종오 ; 소헌영 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 910~916
A current interest in chemistry concerns traceability of analytical measurements to the International System of Units (SI) and the proper estimation of their uncertainties in accordance with the internationally agreed guide provided by the International Organization for Standardization (ISO). Isotope dilution mass spectrometry (IDMS) is regarded as a primary method, which make the measurement results traceable to SI units without significant empirical correction factors. Our laboratory, as the national standards institute of Korea, participated in an intercomparison of environmental analysis, pp'-DDE in corn oil, which was organized by the CCQM under supervision of the CIPM to test feasibility of IDMS as a primary method for the trace analysis of organic compounds. In this report, we provide basic equations used for the calculation of the concentration of the analyte in a sample and a precise description of the processes for the evaluation of the uncertainties of the measurement results. Also, we report the experimental conditions adopted to improve the accuracy of the IDMS measurement. The principles contained in ？？Guide to the Expression of Uncertainty in Measurement'' provided by ISO are followed for the uncertainty evaluation.
Synthesis of 6,13-Bis(thymidinyl)-5,12-dioxocyclams and the Molecular Structure of the (R,S)-Isomer
박재욱 ; Louis S. Hegedus ; Melissa Hellman ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 917~920
The three stereoisomers of the 6,13-bis(thymidinyl)dioxocyclam 6 were synthesized through photoreaction of the chromium alkoxycarbene complex 2 and 1-(benzyloxycarbonyl)-4,4-dimethyl-D 2 -imidazoline. The molecular structure of (R,S)-6 was elucidated by X-ray crystallography.
NMR Study of Poly(γ-Glutamic Acid)Hydrogels Prepared by γ-Irradiation : Characterization of Bond Formation and Scission
한옥희 ; 최혁준 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 921~924
Hydrogels were prepared from poly( Υ-glutamic acid) (PGA) solution by g-irradiation of 90 kGy and 170 kGy. The hydrogels were more cross-linked with a higher dosage g-irradiation and completely hydrolyzed at 85℃ within 4 hours resulting in homogeneous solution. NMR techniques were employed to clarify chemical bond formation and scission involved during γ-irradiation and hydrolysis. Characterization of these samples was carried out by taking both liquid state and solid state NMR spectra of PGA and hydrolyzed hydrogels and comparison of these spectra with the solid state NMR spectra of hydrogels. Our results indicate that complicated chemical bond formation and scission have occurred during hydrolysis and γ-irradiation. The samples prepared with higher dosage of γ-irradiation showed more diverse chemical bond formation and scission.
Suppression of AP-1 Activity by Tanshinone and Cancer Cell Growth Inhibition
박세연 ; 송지성 ; 이덕근 ; 양철학 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 925~928
The process of transcription is the major point at which gene expression is regulated. The jun and fos families of eukaryotic transcription factor heterodimerize to form complexes capable of binding 5'-TGAGTCA-3'DNA elements (AP-1 binding site). To search for the inhibitors of the jun-fos-DNA complex formation, several natural products extracts were screened and methanol extract of tanshen (the dried roots of Salvia miltiorrhiza Bunge) showed remarkable inhibitory activity. The active compounds of the extracts were purified using re-peated column chromatography and recrystallization. Their structures were identified as tanshinone I and tanshinone IIA. Through the electrophoresis mobility shift assay and cell cytotoxicity test, tanshinone I and tanshinone IIA were identified as inhibitors that suppress not only AP-1 function but also the cell proliferation. Tanshinone I also suppressed the jun-fos-DNA complex formation in TPA-induced NIH 3T3 cells.
Synthesis of 6-Alkoxy-3-(1-hydroxyalkyl)-5-nitro-4,5,6,7-terahydroindole-4-carboxylates
김호현 ; 구양모 ; 이윤영 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 929~934
2-( β-Alkoxyvinyl)-4-(1-hydroxyalkyl)pyrroles (14) were synthesized from 4-acylpyrrole-2-carboxylates (8) by sequential reduction of their acyl and alkoxycarbonyl groups to give 4-(1-hydroxyalkyl)pyrrole-2-carbalde-hydes (13) followed by Wittig reaction of the aldehydes with the ylide of alkoxymethylphosphonium chloride. Diels-Alder reaction of 2-(β-alkoxyvinyl)-4-(1-hydroxyalkyl)pyrroles with trans-methyl β-nitroacrylate gave 6-alkoxy-3-(1-hydroxyalkyl)-5-nitro-4,5,6,7-tetrahydroindole-4-carboxylates (3).
Reactivity and Reaction Mechanism for Reactions of 1, 1'-(Azodicarbonyl) dipiperidine with Triphenylphosphines
성대동 ; 최미정 ; 하근문 ; 엄태섭 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 935~938
Reactivity and reaction mechanism for the reactions of 1,1'-(azodicarbonyl) dipiperidine with triphenylphosphines are investigated using kinetic method. The cation radical, Ph3P and the anion radical, -N-N - are produced during the course of the reaction. The cation radical is formed by the transfer of an electron from phosphorus to the nitrogen atom. The anion radical is formed by the addition of the one electron to the azo rad-ical. The rate constants are decreased by electron withdrawing groups while they are increased by electron donating groups present in triphenylphosphine. The electron density increases on nitrogen, while positive charge is developed on phosphorus in the transition state.
Thermodynamic Properties of
Spinel Solid Solution
박봉훈 ; 김동수 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 939~942
The tie lines delineating ion-exchange equilibria between NiFe2O4-NiCr2O4 spinel solid solution and Fe2O3-Cr2O3 corundum solid solution were determined at 900, 1000, and 1200 ℃ by electron microprobe and energy dispersive X-ray analysis of oxide phases, using the flux growth technique. Activities of the spinel components were calculated from the tie lines, assuming Temkin's ideal mixing in the corundum solid solution. The spinel phase could be expressed by a regular solution with negative deviations from ideality. The Gibbs free energies of mixing for spinel solid solution were discussed in terms of the cation distribution model, based on site preference energies and assuming random mixing on both tetrahedral and octahedral sites.
ligand Field Analyses of Tris(biuret)chromium(Ⅲ) Chloride and Hexaureachromium(Ⅲ) Bromide
박성진 ; 오병근 ; 박영동 ; 이규왕 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 943~947
Ligand field analyses for tris(biuret)chromium(III) chloride and hexaureachromium(III) bromide were performed and compared to understand the ligand field properties of both ligands. The optimized eσO and eπO values indicate that coordinated oxygen atom in biuret ligand is a moderate s- and strong p-donor, while that in urea ligand is a weak σ- and moderate π-donor. The electronic structures of those two complexes are quite different and they were well accounted by inclusion of an anisotropic p bonding.
Morecular Orbital Caculations for the Reactions of 2,5-dimethyl Pyrrole with Phenylsulfonyl Chloride
서미경 ; 김진범 ; 성시열 ; 심영기 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 948~952
Electrophilic substitutions on β-position of 2,5-dimethyl pyrrole have been investigated theoretically. The electron donating methyl groups enrich electron densities on C-3, C-4 positions and π* interactions with methyl groups substituted on C-2 and C-5 positions pushed up the HOMO level of the pyrroles consequently induce rapid substitutions on C-3, C-4 sites. Substitution of phenylsulfonyl group on nitrogen stabilized LUMO levels through weak π bonding interactions. Unexpected deoxidation reaction underwent on the sulfonyl group substituted at C-3 position. The structures were solved by X-ray crystallography. Meanwhile, gas phase HF/6-31G* and density functional method (B3LYP/6-31G*) calculations gave favorable energies for 1-phenylsulfinyl pyrrole (6) over 3-phenylsulfinyl pyrrole (5) by 3.6-4.7 kcal/mol which is contrary to the experimental result. However the methods involve the effects of molecular polarizability and solvent, molecular dynamics (MD) and ab-initio self consistent reaction field (SCRF) calculations showed same trend as experiments. According to MD calculations, compound 5 is more stable than compound 6 by 4.15 kcal/mol and the SCRF, HF/6-31G* calculations gave more stable energy value for structure 5 than 6 by 0.03 kcal/mol.
Urea Derivatives of p-tert-Butylcalixarenes: Anion Selective Neutral Receptors
남계천 ; 강성옥 ; 고승환 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 953~956
photocatalytic Activity of
with Oxidation State of Surface-loaded Copper
송강용 ; 권영태 ; 최광진 ; 이완인 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 957~960
Preparation and properties of Dinickel(Ⅱ) Complexes Bridged with μ-Oxalato Ligand: X-Ray Structure of (μ-Oxalato)bis((N,N'-bis(2-aminoethyl)-1,3-propanediamine)nickel(Ⅱ))
곽지훈 ; 정진희 ; 김진권 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 961~964
A Facile Synthesis of [1,2]Oxazinane-3,5-diones
종규관 ; 신승일 ; 김형기 ; 김형래 ; 전동주 ; Ryu, Eung K. ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 965~968
Nonperoxidic Products from the Ozonolyses of Acenaphtylene and 4,5-Methylenephenanthrene
이지원 ; 허태성 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 969~972
One-Pot Synthesis of Mannich Base Using Hydroxy Aromatic Rings and Secondary Amines
지기환 ; 안윤수 ; 심광택 ; 박태호 ; 안정수 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 973~976
Synthesis and Crystal Structure of
노수균 ; 배병재 ; 박준택 ; 정종화 ;
Bulletin of the Korean Chemical Society, volume 20, issue 8, 1999, Pages 977~979